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No. 625,4!4. Patented May 23, I899. F. BADFOBD.

MOWER KNIFE GRINDING MACHINE.

(Application filed Ear. 4, 1898.)

' gnu-nodal.) 2 Shaets-Shat INVENTOR 1m W WM)?! HIS ATTORNEY No.625,4l4. Patented May 23, I899.

, F. BADFORD.

MOWER KNIFE GRINDING MACHINE.

(Application filed Mar. 4, 1898.) (No Model.)

2 Sheets-Sheet 2.

WWII/{55.55 llYVE/VTOR fW W haw-MM fl/S A TORNEY NITED STATES PATENTOFFICE.

FRANK RADFORD, OF DAYTON, OHIO, ASSIGNOR OF ONE-HALF TO EDWVARD O.BOYER, OF SAME PLACE.

MOWER-KNlFE-GRINDING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 625,414, dated May 23,1899. Application filed March 4, 1898. Serial No. 672,490. (No model.)

To all whont it may concern:

Be it known that I, FRANK RADFORD, of Dayton, county of Montgomery, andState of Ohio, have invented a certain new and useful Improvement inMower-Knife-Grinding Machines; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, in which like figures refer tolike parts.

My invention relates to improvements in mower-knife-grinding machines,and it particularly relates to improvements upon that class of suchmachines as are shown and described in the following Letters Patent ofthe United Statesto wit, No. 74,942, dated February 25, 1868, No.83,767, dated November 3, 1868, and No. 97,347, dated December 14, 1869.

My invention therefore consists in the details of construction andarrangement of the parts, as will hereinafter be described, andparticularly referred to in the annexed claims.

In the drawings, Figure 1 illustrates in side elevation a machineembodying my invention, in which illustration the knife-supporting frameis adjusted parallel to the grindingwheel. Fig. 2 is a plan viewthereof, showing the knife-supporting frame adjusted to grind one edgeof one blade of the mowerknife. Fig. 3 illustrates a detail of themowerknife-clamping frame. Fig. 4 is a rear elevation of the preferredform of clampingframe, and Fig. 5 is a sectional view on line m m ofFig. 4.

In said drawings, represents the main frame of the machine, from one endof which rises a rigid shaft 11, upon which is loosely mounted a frame12. Upon the top of frame 12 and loosely pivoted upon said shaft 11 is astandard 13, having upon its top a cross-arm 14, in which shaft 15 isprovided with a bearing. Upon the front end of said shaft 15 is rigidlymounted a grinding-wheel 16, of emery or other suitable grindingcomposition or stone, provided with a periphery 17 and a side 18. Uponthe rear end of said shaft 15 is rigidly mounted a pinion 1E), meshingwith the teeth of gear 20, provided with a bearing on bolt 21, rigidlysecured in arm 22, rigid with and extending downward from and to therear of said standard 13. In the lower end of said arm 22, Fig. 1, isprovided a vertical slot 23, through which passes a bolt 24, which boltalso passes through horizontal slot inthe segmental portion 26 of saidframe 10, by means of which bolt 24 said arm 22 is clamped against saidportion 26 in order to hold the standard 13 in its desired position ofadjustment. Said segment 26 is concentric with said shaft 11. Said arm22 is clamped to segment 26, as aforesaid, in such position that saidstandard 13 does not cause friction against the frame 12 when saidstandard 13 is in the position shown in Fig; 1. The vertical slot 23 inarm 22 of standard 13 permits said standard 13 to be raised to differentheights upon said shaft 11 and clamped in said positions by said bolt24, and at the same time the horizontal slot 25 in segment 26 permitssaid arm 22 and its rigid standard 13, with their attached parts, to behorizontally adjusted within a range of about forty-five degrees and beclamped in any of said positions by bolt 24, passing through said slots23 and 25.

Rising from the frame 10 and at a distance in front of the side 18 ofthe wheel 16 is a bolt 30, Fig. 2, passing through a slot 31 in frame12, which slot 31 is the arc of a circle concentric with said shaft 11.At opposite ends of said slot 31 are lugs 32, which project below thetop surface of frame 10 and are adapted to contact with said frame 10 tolimit the lateral swinging movement of said fame 12 about shaft 11 as acenter. To said lugs 32 are pivoted arms 33, Figs. 1, 2, and 3, whichare united at their upper ends by a rigid bar 34, Figs. 2 and 3, whichbar 34 projects on opposite sides of and beyond said arms 33, and ateach of the opposite ends of said bar 34 is formed a rigid clamp-jaw 35,Figs. 1 and 3, having formed upon its lower end a rigid projection 36,engaging in a slot formed in the lower end of a mating jaw 37, throughwhich jaw 37 loosely passes a screw 38, engaging with threads in saidjaw 35, and said screw 38 being provided with head 39 for operating saidscrew. The adjacent faces of said jaws and 37 are provided near theirupper ends with recesses 40, adapted to accommodate the rib 41 of themower knife-blades'42.

The mower-knife is adjusted laterally in on its pivots toward the side18 of the grinding-wheel, as shown in Fig. 2, when by turning gear byits handle 46 the wheel 16 is revolved at a high rate of speed by reasonof its connected gear 19 and shaft 15, and one tapering edge of aV-shaped blade 42 of the mower-knife is ground to a true edge without areciprocating contact with the grindingwheel, as the angle lateralinclination of the frame 12 adjusts the edge of said blade to a parallelwith the side 18 of the wheel, while the forward inclination of saidclamp-frame adjusts the blade 42 to the proper angle for 1 \Vhen j oneedge of said knife-blade 42 is sufficiently ground, shift frame 12 tothe opposite side; and the remaining edge of said V-shaped knife-blade42 will be ground,\vhen the clamp- 2 vertical jaws 62, having in theirrear faces a a ground cutting edge for said blade.

frame is forwardly inclined.

When one knife-blade is ground on both sides, unloosen clamps and 37 andlaterally 5 adjust the mower-knife therein until the next seam betweenits knives 42 registers with said index 45, when reclamp and grind, asbefore. These operations aforesaid will be continued until all theknife-blades 42 are ground on both edges, there being one clamping foreach of said blades 42.

hen the driving end of the mower-knife is reached in the operation ofgrinding, some j makes of mower-knives have a large rib on the edge ofthe knife toward the grindingwheel and at the end where the drivingconnection is attached.

ing-wheel does not reachdown into the crotch between those blades 42,but more than threefourths of the length of the edges of saidj blades isperfectly ground, which answers all requirements for those blades atsaid end.

Upon the sides of said frame 10 and projecting from the opposite ends ofits segment 26 a are projections 50, Figs. 1 and 2, having inclinedfront faces 51, each provided with an upwardly-inclined andforwardly-projecting To grind these blades at said end, the bolt 24 isloosened and standard 13 raised a sufficient distance to clear. saidrib, when said bolt is tightened and the grinding of the edges of theblades 42 is proceeded with as before, except that the grindbly butnon-longitudinally movable in said projection 54 of slide 55. Theoperation of said screw 57 causes the rim of the mowermachine to beclamped between said faces 51 and 53 or to release therefrom. Said slide55 is-provided on its top with a central longitudinal rib 59, adapted toengage the upper wall of recess or slot 56 in order to reduce friction.

It will be seen that in the construction of the clamp as above describedthe projections and their clamping-faces 51 are on opposite sides at oneend of frame 10, while the clamping-face 53 of projection 54 of slide 55occupies an intermediate or central position at the opposite end of saidframe 10, thus making three clamping-faces occupying the three points ofa triangle and forming a very simple, cheap, and serviceable clamp.

In Figs. 4 and 5 the preferred form of mowerknife-clamping frame andclamp is shown, in which arms '60 are substituted for the aforesaid arms33 and cross-bar 61 is substituted for the aforesaid cross-bar 34, bothof which arms and bar are substantially the same in construction, exceptas hereinafter stated. At the opposite ends of said cross-bar 61 riserecess 63 to receive the rib upon the mowerknife. At about the center ofthe length of said bar 61 rises a jaw 64, Figs. 4 and 5, provided in itsrear face with a recess 65,'corresponding with the aforesaid recess 63in jaw 62 and for the same .purpose. Passing loosely through a hole incross-bar 61 is a bolt 66, having enlarged head 67 loosely restingbetween vertical ribs 68 upon the rear side of cross-bar 61. Upon theforwardly-proj ectin g end of bolt 66 is threaded a handle 69 for thepurpose of drawing bolt-head 67 against the mower-knife bar and lockingit against the jaws 62 and 64 and the rib of the mower-knife bar inrecesses 63 and of said jaws, while the ribs 68 prevent said bolt fromturning in such position that it will not clamp the knifebar.

It will thus be seen that a very efiective, simple,and durable clamp isformed which will securely clamp the knife-bar with but one operation,which result saves considerable time and labor in the grinding of eachmowerknife bar, as said knife-bar must be shifted in said clamping frameand reclamped as many times for each difierent knife-bar as there areteeth in the knife-bar to be ground.

I claim 1. In a mower-knife-grinding machine, a grinding-wheel, astandard supporting a grinding-wheel and located at a point to the rearof the grinding-face of said wheel, a laterallymovable frame pivotedconcentric with said standard and extending in front of the grinding-face of said wheel, a mower-knife clamp pivotally mounted upon saidframe, said frame being adapted to be moved equal distances uponopposite sides of the axis of the grinding wheel for grinding theopposite edges of the same knife-blade, the pivot-point of said framebeing to the rear of the grindin g-face of said grin din g-wheel andvertically below the axis of said grinding-wheel, whereby said clamp maybe moved with said frame equal distances on opposite sides of the axisof said grinding-wheel and in the arc of a circle to grind theoppositely-tapered edges of the same tooth of the mower-knife,substantially as specified.

2. In a mower-knife-grinding machine, the combination of amain frameupon which are pivotally mounted at the same point a standard and aswinging frame, a cross-arm on the top of said standard in whichrevolubly bears a shaft having a grinding-wheel and a gearwheel rigidlysecured upon its opposite ends, a downward projection rigid with saidstandard and revolubly carrying a driving-gear meshing with saidfirst-named gear, means for securing said standard to said main frame, amower-knife-clamping frame pivotally connected to said swinging frame ata point in front of the forward side of the grindingwheel, the axis ofsaid swinging frame being below and at right angles to the axis of thegrinding-shaft and to the rear of said grindingqvheel, and projectionson opposite sides of said swinging frame and adapted to contact with thesides of the main frame for limiting the swinging movement of said frameto an equal distance upon opposite sides of the axis of thegrinding-wheel shaft, substantially as specified.

3. In a mower-knife-grinding machine, the combination of a relativelystationary grinding-wheel support, a grinding-wheel mounted in saidsupport with its side toward the front, alaterally-movable frameindependent of said support and pivoted to the rear of saidgrinding-wheel and vertically below its axis, a mower-knife-clamp framepivotally mounted upon said frame at a point in front of thegrinding-face of said grinding-wheel and adapted to incline toward thefront side of said wheel and be moved a distance upon opposite sides ofthe axis of said wheel, and an index on said clamp-frame adapted toregister with the seam between two of the knifesections for grinding thetwo opposite edges of the knife-blade nearest the axis of said wheel, atone clamping of the mower-knife section, substantially as specified.

4. In a mower-knife-grinding machine, the combination of a main framehaving secured thereto a vertical shaft at one end, a frame looselypivoted on said shaft adjacent said main frame, a standard slidinglymounted upon the top of said shaft, a vertical arm rigid with saidstandard, a vertical slot in said arm, a segmental portion of said mainframe contacting with said vertical arm, said segment being concentricwith said rigid shaft, a horizontal slot in said segmental portion, abolt passing through said vertical and horizontal slots, a cross-armupon the top of said standard, a revoluble shaft bearing therein atright angles to and vertically above the axis of said stationary shaft,.a grinding-wheel rigid upon the front end of said revoluble shaft and agear-wheel rigid upon its rear end, a driving-gear revolubly mountedupon said arm of said standard, a handle for operating saiddriving-gear, and a pivoted knifeclamping frame attached to said pivotedframe at a point in front of said grindingwheel, substantially asspecified.

5. In a moWer-knife-grinding machine, the combination of a main framehaving secured thereto a vertical shaft at one end, a standard slidinglymounted upon the top of said shaft, a vertical arm rigid with saidstandard provided with a vertical slot, a segmental portion of said mainframe contacting with said vertical arm, said segment being concentricwith said'rigid shaft, and provided with a horizontal slot in saidsegmental portion, a bolt passing through said vertical and horizontalslots, a cross-arm upon the top of said standard, a revoluble shaftbearing therein at right angles to and vertically above the'axis of saidstationary shaft, a grinding-wheel rigid upon the front end of saidrevoluble shaft and a gear-wheel rigid upon its rearend, a driving-gearrevolubly mounted upon'said arm of said standard, and a pivotedknifeclamping frame mounted in front of and adapted to be inclinedtoward said grinding-- Wheel, substantially as specified.

6. In a mower-knife-grinding machine, the combination of a base adaptedto be clamped to a part of the mower, a knife-grinding wheel mountedupon a standard and adapted to have the knife ground upon one of itssides, a mower-knife clamp mounted in front of said grinding side ofsaid wheel and independent of said standard, a vertically-slidingconnection between said standard and base, and a projection of saidstandard separate from said sliding connection and adapted to be clampedto said base at different elevations for vertically adjusting saidgrinding-wheel on its sliding connection and with reference to said basefor grinding only certain teeth or blades of the mower-knife,substantially as specified.

7. In a mower-knife-grinding machine, the combination of a main frame, agrindingwheel mounted upon and vertically adjust able with reference tosaid main frame, a laterally-movable frame pivoted upon said main frame,a clamp-frame pivoted upon said laterally-movable frame, of downwardprojec tions 50 on opposite sides of one end of said main frame,inclined faces 51 on said projections, a pin 52 projecting from each ofsaid faces 51, a slot or recess located at the center of said frame andits front end, a slide mount= ed in said slot or recess, inclined face53 car- 'ried by said slide, a screw threaded into a projection of saidmain frame and revolubly but non-longitudinally engaging said slide,substantially as and for the purpose speci fied.

8. In a mower-knife-grinding machine, the combination of a knife-clampformed of arms pivoted at one end and secured to a cross-bar of saidenlarged bolt-head, and a nut or han- 10 at their other end, a verticaljaw on each end dle for operating said bolt, substantially as of saidcross-bar, a vertical jaw at snbstanspecified.

tially the center of said cross-bar, recesses in In witness whereof Ihave hereunto set my the rear face of said jaws, a bolt passing i handthis 1st day of March, 1898.

loosely through said cross-bar and having an FRANK RADFORD. enlargedhead adapted to clamp the mower Witnesses:

knife-bar against said jaws, a lug or rib pro- ISAAC G. KENNEDY,

jecting from said cross-bar on opposite sides IRA C. KOEHNE.

